This issue turned up at work a little while ago and has to do with Internet Explorer 7 blocking sessions and cookies from an external site (with a different domain name) that is loaded within a frameset.
Although I was not actually involved in this particular part of the development or the subsequent buggering around for a fix, one was provided to us by my colleague Fred who has blogged about this issue.
The fix is as follows:
header ('P3P: CP="ALL ADM DEV PSAi COM OUR OTRo STP IND ONL"');
Apparently this is only an issue in IE7. Weird huh?
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